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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d829d9fa5a69c5212df67ed0a929f31fadd1d29b7ac48e5400b7c3fb1aa71c6' 
  AND token = '+oVbJAmWagItvCQD7Y6h3l9URyfywUl8IJyeClmaHCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}